25143 Itokawa的整体表面粗糙度
The Global Surface Roughness of 25143 Itokawa
摘要：
表面粗糙度是了解小行星的地质历史如何影响其小规模地形的一个重要度量标准，它为小行星之间的定量比较提供了一种额外手段。在这项研究中，我们报告了25143 Itokawa的第一张详细的全球表面粗糙度地图，水平尺度为8- 32 m。对丝川小行星与另一颗可以进行这种分析的小行星433爱神星表面粗糙度的空间分布进行比较后发现，这两颗小行星受不同地质过程的支配。在丝川，表面粗糙度反映了下坡活动的结果，这些活动将细粒物质移动到重力位低，并将大块物质留在重力位高。爱神星433的表面粗糙度是由地质学上最近的大型撞击坑所控制。此外，表面粗糙度的纵向空间变化可能会影响YORP对丝川的作用。
英文摘要：
Surface roughness is an important metric in understanding how the geologic history of an asteroid affects its small-scale topography and it provides an additional means to quantitatively compare one asteroid with another. In this study, we report the first detailed global surface roughness maps of 25143 Itokawa at horizontal scales from 8--32~m. Comparison of the spatial distribution of the surface roughness of Itokawa with 433 Eros, the other asteroid for which this kind of analysis has been possible, indicates that the two asteroids are dominated by different geologic processes. On Itokawa, the surface roughness reflects the results of down-slope activity that moves fine grained material into geopotential lows and leaves large blocks in geopotential highs. On 433 Eros, the surface roughness is controlled by geologically-recent large impact craters. In addition, large longitudinal spatial variations of surface roughness could impact the role of YORP on Itokawa.
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